Step 1:
Unscrew pump element. If the piston of the pump
element gets stuck in the lubricant present in the
strainer ring, remove it with a suitable tool
( Fig.30).
Step 2:
Remove bothersome lubricant between the internal
thread, guide slot in the strainer ring and the groove
between the cam disc and return disc with a suitable
tool.
The pump elements are fitted only with O-
ring 15.4x2.1 (1) without any additional
sealing ring.
( Fig.31).
Fig.30. Removing the piston
Step 3:
Pull piston of the new pump element as far as
possible out of the element, and insert it along the
guide slot of the strainer ring between the cam disc
and return disc ( Fig.32). If the pump element has
not been correctly installed, it is not possible to
tighten the thread.
The piston pump unit must be vented after
replacement of the pump element.
Fig.32. Sectional top view of pump housing
1 Internal thread
2 Guide slot in strainer ring
3 Cam disc
4 Return disc
Fig.33. Inserting the pump element
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